therapeutic vs medicinal drug

therapeutic and medicinal drug both are nouns.

Word	Noun	Adjective	Verb	Adverb
therapeutic	Yes	Yes	No	No
medicinal drug	Yes	No	No	No

As nouns, medicinal drug is a hypernym of therapeutic; that is, medicinal drug is a word with a broader meaning than therapeutic:

therapeutic: a medicine or therapy that cures disease or relieve pain
medicinal drug: (medicine) something that treats or prevents or alleviates the symptoms of disease

Other hypernyms of therapeutic include medicament, medication, medicine.

therapeutic (noun)	medicinal drug (noun)
a medicine or therapy that cures disease or relieve pain	(medicine) something that treats or prevents or alleviates the symptoms of disease

therapeutic (adjective)	medicinal drug (adjective)
relating to or involved in therapy
tending to cure or restore to health